Neritina pulligera (IMAGE) University of Guam Caption Neritina pulligera, one of Guam’s most common freshwater snails found at many elevations in most all of Guam’s rivers. This is one of 60 target diadromous animal species that a project under the University of Guam’s EPSCoR grant is working to genetically analyze. Credit University of Guam NSF EPSCoR Usage Restrictions For use only in media coverage of this press release. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.